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Ornate bichir and black ghost knifefish

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Hey guys.
I am planning a 520US gallon predatory fish tank. I am planning on putting in a ornate bichir and a black ghost knifefish and then maybe add a few more fish if the tank is looking empty. Would the two be aggressive to each other. I am pretty sure they require the same contortions so I think I would be good on that front. Another thing I heard bichirs need a sandy substrate so they don't get hurt. Is this true. I would also like to put in a few plants to create a natural look. I was thinking about putting an elephant nose fish and an African butterflyfish but I'm worried they might get eaten by the burchir. At help and advice would be greatly appreciated. Also what should I feed. I was thinking ghost shrimp and feeder platys that I would raise myself in a 50 gal and a few feeder worms you would normally feed to snakes and scorpions. Would my idea work?

It's my opinion that a lot of these ideas that surface here are largely driven by a certain coolness aspect. It's mixing predators and that's always tricky.
Somehow we never get the "I want a 550 gallon tank, can I house 1000 neon tetras in there".

Anyway, excuse the rant. Monster if only for the practicalities like filtration and heating and the supports for big tanks.

supports and filtration aren't the hard part in my opinion, to be honest lighting and heating are the major killers to me... Supports just need more wood and a concrete floor, filtration can be done with a nice big sump and a overflow with some powerheads to move the water well.

Heating is a tough part (at least economically) and same with lighting if you want plants or to be able to see the fish well

Yeah, you'd be looking at 8, 10 ft of tank length I'd say. That's a lot of T5 tubes and a few big heaters or some inlines. Let's say you don't overdo the lights and use twin T5HO you'd still be looking at 2 watts per inch of tank length. Want decent growth? Double that! Setup like this you'd be drawing at least 800watts continuously with the lights on, more if the ambiant temp drops. At our prices of about 30 dollarcents per Kw/h I wouldn't want to have the electricity bill for this.